Explain double decomposition reaction. What are the types of double decomposition reaction? Explain with the example.
A type of chemical change in which two compounds in a solution react to form two new compounds by the mutual exchange of radicals. Usually, a solid is formed as a result of the reaction.
These reactions are of two types: Precipitation reactions and Neutralisation reactions .
Precipitation reactions
The insoluble solid formed during double displacement reactions is called a precipitate. Reactions in which a precipitate is formed as one of the products are also called as precipitation reactions.
Sodium sulphate reacts with barium chloride to form barium sulphate and sodium chloride solution.
Na2SO4 (aq) + BaCl2 → BaSO4(s) + 2NaCl(aq)
Sodium sulphate Barium chloride Barium sulphate Sodium chloride
Neutralisation reactions
The reaction between an acid and a base to form a salt and water is called as neutralization reaction.
NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)
Sodium hydroxide Hydrochloric acid Sodium chloride Water